LG GLOFA-GM Series User Manual page 348

Appendix
A.1.3 LED indication specifications during abnormal
LED operations if abnormal are divided into two cases.
1) When in state of SYS-ERROR LED Off, the communication error LED flashes at intervals, it means that
installation of communication cable or basic parameter setting is abnormal. At this time, it can be solved by
seeing chapter 11, Troubleshooting.
2) When serious H/W error occurs, No.15 LED (SYS-ERROR) flashes in period of 1 sec, and the error state is
indicated by LED No. 0 – 3. When serious H/W failure occurs, the various errors are indicated by LED No. 0 - 3,
of which LED No. 0 is lower Bit (d0), LED No. 3 is upper Bit (d3), and these vallues are converted from binary
into decimal values to indicate error code.
[Table A.4] Error codes during serious failure occurence
Error code
[Note1]
1
2
3
4
5
6
7
8
9
10
11
12 ~ 15
If an error code is indicated except error codes of No.'5' & '7', Cnet I/F module is seriously damaged. Contact our
company's service station to solve the problem. For errors of No. '5' & '7', refer to chapter 11, Troubleshooting.
Remark
[Note1] If in serious failure, SYS-ERROR LED flashes in period of 1 sec and the error code is indicated by LED No.
0~3. Example of error code calculation is as below.
If LED No.0,1,2 are ON, error code value calculation : 2
If LED No.1,3 are ON, error code value calculation : 2
Error contents
Internal memory diagnosis error
Common use memory reading/writing error
Common use memory access error
PLC CPU interface stop
Flash memory reading/writing error
UART (NS-16550) access error
Operation mode setting error
Reserved
Address error
Invalid instruction
Zero divide
Reserved
A-5
operation
+2 +2 =1+2+4=7
0 1 2
+2 =2+8=10
1 3
Remark
H/W error
Mode setting abnormal
Not used
Other error
Not used